This game is quite new, so I guess nobody bought it yet I'm also testing the "trial". I can't see the achievements in this "demo". I wonder if they are hard or easy...

If the first few are any indication, then they will be very easy. For the first one (Hungry), simply complete the level, pulling straight down to eat all three ducks and coins which are in a vertical line, achievement unlocked.

Got the second achievement (Duck Meet Mouth) on the level 3, just aim for the top of the platform, right under the duck, the duck will launch up and into your mouth while you are in the air.

Third achievement for simply following the instruction to jump through the Rubber Ring, which completes the level in a single shot, on level 4.